Steel retainer for rock drills



April 17, 1928. 1,666,176

E. B. LEAR STEEL RETAINER FOR ROCK DRILLS Filed June 16, 192'? I I I l I I l 1 1 0 I H Y Q G E E 0% /U F Y' Y INVENTOR. E", ZBLeaz'.

' 1 115 ATTO BY.

Patented Apr. 17, 1928.

EARL B. LEAR, OF PHILLIPSBURG, NE'W JERSEY. JLSSIGNOB T INGERSOLL-RAND COIVE- PANY, OF JERSEY CITY, NEW J ERSEY, A CORPORATION OF NEW'JERSEY.

STEEL RETAINER. iron ROCK paints.

Application filed June 16, 1927. serial at. 199,258

This inventionrelates to rock drills, but more particularly to a steel reta ner for fluid actuated rock dIlllS, of the type in which the working implement is disposed loosely in the front end of the drill.

The objects of the invention are to retain the drill steel in the front head of the drill and to construct a retainer which comprises onlya few simple parts capable of being readily assembled on the front head and removed therefrom.

1 Other objects will in, part pointed out hereinaften' The invention is shown in. one of its preferred forms in the accompanying drawings. in which 7. a y

Figure 1 is a'sectional elevation of the front end of a rock drill having the invention applied thereto, a

Figure 2 is a side view in elevation partly in section taken through Figure 1 on the line 22 looking in the direction indicated by the arrows, and

Figure 3 is a view similar to Figure2 7 showing. a modification of the invention.

Referring to the drawings, A represents a cylinder of a rock drill in which is disposed a reciprocatoryhammer piston Bhav- 7 flutes H in the piston extension C in a well known manner for imparting rotary n1oveing a fluted forward extension C. A front' cylinder extension D forms a closure for the front end of the cylinder A and. is bored toslidably receive the extension C of the piston.

Connected to the frontend of the cylinder extension D, as by means of the usual side bolts (not shown), is a front head E whiclr acts as a housing for the chuck mechanism;

comprising, in thisinstance, a: chuck F disposed rotatably in the front head. The chuck F is suitably interlocked with a fluted chuck nut G which interlocks slidably with ment of the piston to the chuck parts.

Disposed in the chuck F is a working implement or drill steel J, the shank K of which extends into the path ofthe hammer piston to receive the blows thereof. At the juncture of the drill steel J and the shank K is formed a collar L which abuts the front end of the chuck F for limiting the distance which the shank K may extend inv to the chuck F.

In accordance with the present invention, means are provided for preventing e ect on be in part obvious and p Q, are curved surfaces Siwhich conform to in the apertures R. A

been thus assembled, the yoke may be placed:

of the working implement J from" the front head. To that end a retainer 0 comprising a yoke P and side armsQ, is so'disposed with respect .to the front head E that in the operative position of the retainer, the yoke P encircles the drill steel J at a'point sufiicien'tly forwardly of the collar L to permit 1 I of considerable longitudinal. movement. of

the drill steel.

R. On the rearward endsof the sidearms curved surfaces T on opposite sides of and on the forward surface of an enlargement 'U. located on the side of the front head E and preferably near, the front 'end' thereof. The

eccentri cally with respect to the curved end surfaces S of the'si de arms.

I11. order to form a pivot for the' retai'nerf O, a pin V is disposed forwardly ofthe enlargement U and extends transversely with The ends W of respect to thefront'h'ead. I the pinV extend into the apertures R and The side arms Q, extendf' apertures R in this instance are'located' are of slightly smaller diameter than the.

body, portion of the pin.

Suitable means are provided for 'yieldably securing the retainer 0 to the-enlargement U and also reform a guide forthe pinV' so that the retainer yoke P will at all times be held substantially concentrically withre spect to the working implement J To that,

end a bolt X is disposed slidably: through the enlargementU and the said pin Vbetween the side arms Q, and is of such length; that its-lowermost or front endY extends a sufficient distance forwardly of the pin for thereceptionof a cushioning spring Z."

The cushioningspring Z in'this'instance bears at one end on a nut Z) screwed on the end of the bolti'and withits other enddon the .first be spread a suficient distance to enable the ends V of the fpin V to be inserted er these parts have in the operative'position on "the front head and after the bolt X has bee n ted nto pin V against which it exertsa pressure to l 7 force the end surfaces 'Sof the side arms largement U and after the spring Z has plaeed'on the bolt f, the nut may be screwed,

the enlargement and the pin V, the spring Z may be placed on the bolt and the nut b screwed on the bolt to a position which will set up the required tension in the spring Z to hold the cooperating surfaces of the side arms and of the enlargement firmly together.

Whenever it is desired to remove'the drill steel J from the front head E, the retainer 0 may be rocked to the position indicated in dotand dash lines in Figure 1. In this position the yoke P of the retainer will have been moved to one side of the collar L of the drill steel and the drill steel may then be freely Withdrawn from the front head. In

the inoperative position of the retainer 0,

the said retainer will also be held securely in the releasing position by the spring Z. After another drill steel has been inserted in the front head, the retainer 0 mayagain be rocked to 1ts initial position wherein it will be securely held by the spring againstthe effects of vibrationand jars caused by the reciprocation of the hammer piston 13.

Referring now to the modification shown in Figure 3, the front head E, the enlargement U and the yoke O are in all essential respects similar to the corresponding elements shown in the modification described in connection with and as shown in Figures 1 and 2. In the present instance the retainer 0 is pivoted on a bolt (Z which extends through the apertures R of the sine arms Q. The bolt (Z in this instance is supported by a head 6 of a bolt f extending sli'dably through an aperture 9 in the enlargement U. The head 0 is preferably, though not necessarily, of such Width that its ends abut the inner surfaces of the side arms Q. As Will be observed, the bolt f extends rearwardly of the enlargement U a sufficient distance to receive a cushioning spring Z which seats with its front end on the enlargement U and with its rearward end on a nut Z) screwedon the end of the bolt f.

In assembling the device described in this modification, the head 6 of the bolt finay first be placed in position between the side arms Q, to receive the bolt (Z. After these parts have been thus assembled, the bolt f may be disposed in the aperture f/ of the eubeen 1 G38 ire on the end of the bolt f to a point thereon Which will set up the desired tension in the spring Z.

I claim: I; k

l. A steel retainer for arock drill, comprising in combination a front head, an enlargement on the front head having seating surfaces on one side thereof, a floating pin beneath the enlargement and extending transversely of the front head, means for guiding the pin, a retainer pivoted on the pin having end surfaces shaped to conform to the seating surfaces, and spring on the said guiding means exerting a pressure on the pin for holding the end surfaces firmly against the seating surfaces.

2. A steel retainer fora rock drill, comprising in combination a front head, an enlargement on the front head having curved seating surfaces on one side thereof, a floating pin beneath the enlargement and extending transversely of the front head, one bolt associated With the pin and the enlarge ment for guiding the pin, a yoked retainer pivoted on the pin having curved end surfaces on each side of said means seating on the seatingsurfaces, and a spring on the said guiding means exerting a pressure on the pin for holding the end surfaces firmly against the seating surfaces.

3. A steel retainer for a rock drill, comprising in combination a front head, an en largement on the front head having curved seating surfaces on one side thereof, a floating pin forwardly of the enlargement and extending transversely thereof, a bolt fass oc'iated with the pin and the enlargement for guiding the pin, a retainer COIHPTl SlITQ a yoke and side arms, said side arms being disposed on opposite sides of the-bolt and having apertures in their free ends to pivotally receive the pin, curved end surfaces on the side arms bearing against the seating surfaces, said end surfaces being located eccentricaily With respect to the pin, and

a spring on the guiding means exerting'a pressure to hold the end surfaces firmly against the seating surfaces.

In testimony whereoi I have signed this specification.

EAR-L B. Lean. 

